From patchwork Tue Oct 29 12:18:39 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sudeep KarkadaNagesha X-Patchwork-Id: 3107801 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id E9D219F2B7 for ; Tue, 29 Oct 2013 12:18:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B97D22020E for ; Tue, 29 Oct 2013 12:18:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6F3CC2020F for ; Tue, 29 Oct 2013 12:18:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753019Ab3J2MSb (ORCPT ); Tue, 29 Oct 2013 08:18:31 -0400 Received: from cam-admin0.cambridge.arm.com ([217.140.96.50]:42528 "EHLO cam-admin0.cambridge.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752547Ab3J2MS1 (ORCPT ); Tue, 29 Oct 2013 08:18:27 -0400 Received: from e103737-lin.cambridge.arm.com (e103737-lin.cambridge.arm.com [10.1.207.23]) by cam-admin0.cambridge.arm.com (8.12.6/8.12.6) with ESMTP id r9TCINkl004551; Tue, 29 Oct 2013 12:18:23 GMT From: Sudeep KarkadaNagesha To: "Rafael J. Wysocki" Cc: Sudeep.KarkadaNagesha@arm.com, Viresh Kumar , linux-pm@vger.kernel.org, cpufreq@vger.kernel.org, Sudeep KarkadaNagesha Subject: [PATCH v3 3/4] cpufreq: arm_big_little: add vexpress SPC interface driver Date: Tue, 29 Oct 2013 12:18:39 +0000 Message-Id: <1383049120-8336-4-git-send-email-Sudeep.KarkadaNagesha@arm.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1383049120-8336-1-git-send-email-Sudeep.KarkadaNagesha@arm.com> References: <1383049120-8336-1-git-send-email-Sudeep.KarkadaNagesha@arm.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Sudeep KarkadaNagesha The TC2(i.e. CA15_A7) Versatile Express has external Cortex M3 based power controller which is responsible for CPU DVFS and SPC provides the interface for the same. This patch adds a tiny interface driver to check if OPPs are initialised by SPC platform code and register the arm_big_little cpufreq driver. Signed-off-by: Sudeep KarkadaNagesha Acked-by: Nicolas Pitre Acked-by: Viresh Kumar --- drivers/cpufreq/Kconfig.arm | 8 ++++ drivers/cpufreq/Makefile | 1 + drivers/cpufreq/vexpress-spc-cpufreq.c | 70 ++++++++++++++++++++++++++++++++++ 3 files changed, 79 insertions(+) create mode 100644 drivers/cpufreq/vexpress-spc-cpufreq.c diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm index 701ec95..ce52ed9 100644 --- a/drivers/cpufreq/Kconfig.arm +++ b/drivers/cpufreq/Kconfig.arm @@ -224,3 +224,11 @@ config ARM_TEGRA_CPUFREQ default y help This adds the CPUFreq driver support for TEGRA SOCs. + +config ARM_VEXPRESS_SPC_CPUFREQ + tristate "Versatile Express SPC based CPUfreq driver" + select ARM_BIG_LITTLE_CPUFREQ + depends on ARCH_VEXPRESS_SPC + help + This add the CPUfreq driver support for Versatile Express + big.LITTLE platforms using SPC for power management. diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile index b7948bb..7494565 100644 --- a/drivers/cpufreq/Makefile +++ b/drivers/cpufreq/Makefile @@ -74,6 +74,7 @@ obj-$(CONFIG_ARM_SA1100_CPUFREQ) += sa1100-cpufreq.o obj-$(CONFIG_ARM_SA1110_CPUFREQ) += sa1110-cpufreq.o obj-$(CONFIG_ARM_SPEAR_CPUFREQ) += spear-cpufreq.o obj-$(CONFIG_ARM_TEGRA_CPUFREQ) += tegra-cpufreq.o +obj-$(CONFIG_ARM_VEXPRESS_SPC_CPUFREQ) += vexpress-spc-cpufreq.o ################################################################################## # PowerPC platform drivers diff --git a/drivers/cpufreq/vexpress-spc-cpufreq.c b/drivers/cpufreq/vexpress-spc-cpufreq.c new file mode 100644 index 0000000..7f7c9c0 --- /dev/null +++ b/drivers/cpufreq/vexpress-spc-cpufreq.c @@ -0,0 +1,70 @@ +/* + * Versatile Express SPC CPUFreq Interface driver + * + * It provides necessary ops to arm_big_little cpufreq driver. + * + * Copyright (C) 2013 ARM Ltd. + * Sudeep KarkadaNagesha + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include + +#include "arm_big_little.h" + +static int ve_spc_init_opp_table(struct device *cpu_dev) +{ + /* + * platform specific SPC code must initialise the opp table + * so just check if the OPP count is non-zero + */ + return dev_pm_opp_get_opp_count(cpu_dev) <= 0; +} + +static int ve_spc_get_transition_latency(struct device *cpu_dev) +{ + return 1000000; /* 1 ms */ +} + +static struct cpufreq_arm_bL_ops ve_spc_cpufreq_ops = { + .name = "vexpress-spc", + .get_transition_latency = ve_spc_get_transition_latency, + .init_opp_table = ve_spc_init_opp_table, +}; + +static int ve_spc_cpufreq_probe(struct platform_device *pdev) +{ + return bL_cpufreq_register(&ve_spc_cpufreq_ops); +} + +static int ve_spc_cpufreq_remove(struct platform_device *pdev) +{ + bL_cpufreq_unregister(&ve_spc_cpufreq_ops); + return 0; +} + +static struct platform_driver ve_spc_cpufreq_platdrv = { + .driver = { + .name = "vexpress-spc-cpufreq", + .owner = THIS_MODULE, + }, + .probe = ve_spc_cpufreq_probe, + .remove = ve_spc_cpufreq_remove, +}; +module_platform_driver(ve_spc_cpufreq_platdrv); + +MODULE_LICENSE("GPL");